基于PFC<sup>3D</sup>的鱼鳅坡滑坡运动过程分析

张家勇; 邹银先; 杨大山

doi:10.16031/j.cnki.issn.1003-8035.2021.04-05

基于PFC^3D的鱼鳅坡滑坡运动过程分析

贵州省地质环境监测院，贵州贵阳　550001

基金项目: 贵州省提升地质灾害监测预警科技能力行动方案项目（GZMC-ZG201910003）

详细信息

作者简介: 张家勇（1981-），男，贵州开阳人，硕士，高级工程师，主研领域为地学大数据分析应用与可视化研究。E-mail：75766880@qq.com

中图分类号: P642.22

收稿日期: 2021-04-27

修回日期: 2020-07-22

刊出日期: 2021-08-25

Analysis of Yuqiupo landslide motion process based on PFC^3D

Guizhou Geological Environment Monitoring Institute, Guiyang,Guizhou　550001, China

Received Date: 27 April 2021

Revised Date: 22 July 2020

Publish Date: 25 August 2021

摘要

摘要:
以贵州省开阳县鱼鳅坡滑坡为研究对象，采用颗粒流离散元（PFC^3D）对其破坏运动过程进行数值模拟。采用Ball-Wall建模方法建立滑坡模型，对滑坡不同关键部位颗粒进行位移、速度监测，阐明其破坏运动特征。结果表明，降雨为鱼鳅坡滑坡的直接诱发因素。该滑坡在破坏初始阶段以蠕滑变形为主，随着变形量的增加，滑坡体不断挤压坡脚，滑坡岩土体到达应力平衡极限，坡脚产生剪切破坏，并向上牵引发展，滑坡发生整体滑动，斜坡变形破坏模式为蠕滑-拉裂，按照力学条件为牵引式破坏。滑坡滑动最高时速12.4 m/s，最大滑移80 m，滑动阶段持续50 s。研究成果可为对该类滑坡影响范围预测，以及工程措施的制定具有一定的参考意义。
- 滑坡 /
- 运动过程 /
- 颗粒流 /
- 数值模拟
Abstract:
A case study of the Yuqiupo landslide in Kaiyang County, Guizhou Province, the particle flow discrete element (PFC^3D) was used to simulate the failure process of the landslide. The landslide model was built through the Ball-Wall method, and the characteristics of their destructive movement was described through the monitoring of the displacement and velocity of the particles at different key parts of the landslide. The results show that the rainfall is the direct inducing factor of the Yuqiupo landslide. In the initial stage of failure, the landslide is mainly creep deformation. The landslide continuously squeezes the slope toe with the increase of the deformation. The landslide rock-soil mass reaches the stress equilibrium limit, leading to shear failure at the slope foot, and the landslide happens with upward traction development, the failure mode is creep-crack, and it is traction failure according to the mechanical conditions. The maximum sliding speed of the landslide is 12.4 m/s, the maximum sliding slip is 80 m, and the sliding stage lasts for 50 s. The results have a good applicability to simulate the process of landslide destruction, which can provide a reference for engineering construction.
- landslide /
- motion process /
- grain flow /
- the numerical simulation

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图 1 滑坡发生前后影像图

Figure 1.

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图 2 鱼鳅坡滑坡平面图

Figure 2.

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图 3 滑坡剖面图（I−I′）

Figure 3.

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图 4 滑坡数值计算模型

Figure 4.

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图 5 不同时步速度云图（单位：m）

Figure 5.

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图 6 速度时程曲线

Figure 6.

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图 7 位移时程曲线

Figure 7.

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图 8 平均速度、位移时程曲线

Figure 8.

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表 1 滑坡岩土体颗粒细观参数

Table 1. Mesoscopic parameters of rock and soil particles in landslide

细观参数	碎石土
颗粒密度/(kg·m⁻³)	2000
颗粒半径/m	0.25～0.5
法向接触刚度/MPa	28
切向接触刚度/MPa	28
摩擦系数	0.3
法向黏结刚度/(MPa·m⁻¹)	10
切向黏结刚度/(MPa·m⁻¹)	10
黏结抗拉强度/MPa	0.1
黏结抗剪强度/MPa	0.75

下载: 导出CSV

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